A plane cuts through the cube, creating a pentagon-shaped cross section. The plane is slanting and may pass through a pair of adjacent vertices of the base.
What is the plane about?
Let us say that the cube is laying on the floor in a flat manner. If a person look in, one can see a full square.
Then by cutting plane one can create a cross-sectional shape of a pentagon.
Note that it is a closed figure made up of 5 sides. The cutting plane will not be vertical and it we say that the cutting plane is slanting, it would create a pentagon cross section and it will move between two adjacent vertices, and three adjacent sides.
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